Valved spark plug



Sept. 18, 1928. 1,685,017

J. G. BOWMAN VALVED SPARK PLUG Filed July 25, 1927 INVENTOR.

(75in; G. Bowman A TTORNEY.

Patented Sept; 18, 1 928.

1* UNITED sIrArEs ceremonies J'OHN G. BOWMAN, OF KAIYSAS CITY, MISSOURI;ASSIGN'Q'R, OE ONE-HALF T0 W L IAM G/HASELTINE, 0 F KAN SA S GIIY, MISSOURI.

VALVED. SPARK PLUG.

pll e iw; merrily 2. 22 f r ei 208,201.,

The invention relates to valvedsparkplugs, and particularly to: sparltplugs constructed with ventilating valv6 .:-tl1at is, with means foradmitting airftllrough the sparkplugs It is animportant aim of theinycntion to provide a novel coordination, of the valve and the cylinderoitan internal combustion motor to the end, of elfectingefiicientt'unctioning. of: the, Valve device for. admission of air.through the plug, and to of gases, at the samejtime that the applianceoperates quietly with. a. minimum-oi; wear. It is a further aim toenable. the, ein'bodis ment of the, valve for such plug. in an extremelyinexpensive fornn Additional objects, advantages and features ofinvention reside inthe construction, arrangement anclcombination of.parts, as will be understood from followingrdescription accompanyingdrawings, wherein i Figure 1 isa. central verticalsectionalviewv of aplug const nugtedlin :accordancewith my invention. Figure 2 is anenlarged central longitudinal sectional view ofthe valve, alone.

Figure 3 is an elevational view of the valve case.

Figure 4 is a view similar to Figure 2 of another embodiment of theinvention.

There is illustrated a plug 10 engaged in the head of a cylinder 11 ofan internal combustion engine, the plug being of a conventionalconstruction including the case 10, a porcelain core electrode 13 andretaining gland 14 for the electrode. A horizontal in teriorly threadedopening 15 is formed through the case 10 inwardly of the shoulder of theporcelain, and'screwed into the opening 15 there is a thimble-likecylindrical valve casing 16, adapted to .be drawn from sheet metal. Thisis exteriorly threaded at its open end and screwed snugly into thepassage 15. Intermediately of the length of the case 16 aport 17 isformed, while the inner end edge of the case is curved inwardly as at22'. Loosely slidable in the case 16 there is a valve 19 similar to thecase. having' its outer end integrally closed by a head, while its innerend is open. One or more ports are formed in the side of this valve or aseries of ports, and alined with these a circumscribing groove 21 isformed, which prevent escape,

may be produced by indenting the periphery of the valve by'spinning orotherwise after having first beenidrawn to thimble shape; It is to benoted: that the valve 19 has a lead or closed; end 22 snugly andslidably fitted in the case 16. The port ,i 17 beingspacedasu-bstantialdistance from the. outer closed, end 18 ofthe" case 16, it

will be seen that a certaindash-pot action' will occur in the movement055 the valve head 22- in, that part of the case outwardly oi the port17. The distance between the inturned end portion 22; of the case 16 andthe port 17 is the sameas the distance be tween the inner or open end ofthe valve 19 and groove 21, so that when the end: oftho valve restsagainst the inturnedporti'on 22" the groove 21 isalined with the port17.

In, the manufacture of this device, the case. is formed as a simpleheaded cylinder without the inturned portion 22" and the valve formedcompletely, so that it is adapted to! function suitably in the case;The, valve is; then introduced in the case and the, edge of the caseturned in at 22 so that when the valve rests against the inturnedportion, the groove 21 will aline with the port 17. The threads upon thecase may be formed 7 in the manufacture, and after assembly of the partsas indicated, may be screwed into the passage 15 of the plug until itsinner end lies at, or adjacent, the inner face of the plug-case, butstopping short of the porcelain core.

In use, when a motor equipped with this plugis oncompress'ion stroke, itwill be the cylindrical at any convenient stage seen that the valve willbe forced outwardly I into the case 16, and will so remain during theworking stroke and the scavenging On the suction or intake-stroke of theengine, however, it will be apparent that the valve will be drawninwardly so that the groove 20 alines with the port 17 shown, which isof material advantage in such devices where quietness of operation isdesired. A. substantial space or dash-pot 23 is formed in the outer partof the ease beyond the port 17 and on the compression stroke, thetendency of the [valve :to be moved abruptly to the outer limit of itsmovement is checked by dash-pot action in the portion 23. Similarily, atthe beginning of the-intake stroke of the motor a slightly vacuouscondition produced in the dash' pot after a certain amount of movementthe valve toward open position will prevent it-from fimoving so rapidlyto the inner limit of its 7 ing, and 'a suitable vent 25 provided topermovement as to produce any objectionable click, and this will alsominimizewear u )on the inturned part of the case and the end of thevalve. r i

Any gas which may remain under pressure in the outer end of the case oncompletion of the working stroke will gradually move the valve towardopen position on the scavenging stroke or at the completion 1 thereof.

It is possible to construct my valve withoutthe use of dash-pot actionbut with a cushion for the valve of mechanical construction, as shown inFigure l, where in place of the dash pot chamber 23 a packing 24 isintroduced in the closed end of the casmit free action of the valveuntil checked by the cushion. Under opposite movement of the valvethatis, to open r,posit-ionnecessity for cushioning is less, and sound isminimized by reason of the rapid movement of air inwardly through theport of valve toward the open end of the case, said the case, means tolimit movement of the valve having a lateral port constructed andarranged to tommunicate with the port of the case" when adjacentthe'outer limit of its movement in the case.

2. In a valve of the character described, a tubular casing having aclosed head at one end, a valve of like form slidable in the case withits head next the head of the case, said valve having a port in the sidespaced from its head,said case having a port in its side differentlyspaced from its head and adapted to register with the port ofthevalvewhen the valveis at one limit of its movement.

3. In a valve of the, character described,

a case of tubular form having a closed end and an open end, a lateralport intermedi ately of the length ofthecasing, a cushion materialwithin the case at the closed'end, a valve of similar form snuglyslidable in .the case with its 'closedend toward the cushion and havinga lateral portadapted to aline with the port ofthe case at one extremelimit of movement of the valve.

In testimony whereof I afiix my signature.

JOHN G. BOWMAN.

